The 11th International Symposium on Insect-Plant Relationships (SIP11), held on August 4-10, 2001, in Helsingør, Denmark, followed the tradition of previous SIP meetings and covered topics of different levels from chemistry, physiology, and ethology to ecology, genetics, and evolution of insect-plant relationships. The present volume includes a representative selection of fully refereed papers as well as a complete list of all the contributions which were presented at the meeting. Reviews of selected topics as well as original experimental data are included. The book provides valuable information for students and research workers interested in chemical and biological aspects of interactions between individuals and populations of different organisms.

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Preface. Acknowledgements. List of Participants. Oral and Poster Presentations. Neuronal basis for perception of chemical stimuli. Encoding of plant odour information in insects: peripheral and central mechanisms; H. Mustaparta. Chemosensory bases of behaviour. How do herbivorous insects cope with noxious secondary plant compounds in their diet? J.I. Glendinning. Flavonoids from cabbage are feeding stimulants for diamondback moth larvae additional to glucosinolates: chemoreception and behaviour; J.J.A. van Loon, et al. Chemical basis for host plant selection. The chemical world of crucivores: lures, treats and traps; J. Alan, A. Renwick. The role of pollen odour in the attraction of pollen beetles to oilseed rape flowers; S. Cook, et al. Insect feeding deterrent activity of lignans and related phenylpropanoids with a methylenedioxyphenyl (piperonyl) structure moiety; J. Harmatha, J. Nawrot. Host specificity and host recognition in a chemically-defended herbivore, the tenthredinid sawfly Rhadinoceraea nodicornis; A. Barker, et al. Effects of age, sex, and dietary history on response to cucurbitacin in Acalymma vittatum; R.R. Smyth, et al. Incidence of apple fruit and leaf surface metabolites on Cydia pomonella oviposition; N. Lombarkia, S. Derridj. Behaviour and performance on plants. The role of sinigrin in host plant recognition by aphids during initial plant penetration; B. Gabrys, W.F. Tjallingii. Within species variation in host plant quality and movement behavior of Lygus rugulipennis nymphs; S. Hannunen, B. Ekbom. Xylem ingestion by winged aphids; G. Powell, J. Hardie. The effect of different plant nutrient regimes on the aphid Macrosiphum euphorbiae growing on petunia; J. Janssen, B. Ekbom. Performance of pine looper Bupalus piniarius larvae under population build-up conditions; A. Smits. Effects of plant defences on insects (individuals and populations). Interactive effects of leaf maturation and phenolics on consumption and growth of a geometrid moth; E. Haukioja. Aphid response to elevated ozone and CO2; J.K. Holopainen. The effect of ozone fumigation and different Brassica rapa lines on the feeding behaviour of Pieris brassicae larvae; P. Jøndrup, et al. Host plant derived feeding deterrence towards ants in the turnip sawfly Athalia rosae; C. Müller, et al. Qualification of grassland habitats based on their Orthoptera assemblage in the Köszeg Mountains (W-Hungary); G. Szöveny. Effects of insects on plants (individuals and populations). Insect-plant interactions on a planet of weeds; P. McEvoy. Interactions between several trophic levels. Induction of plant responses to oviposition and feeding by herbivorous arthropods: a comparison; M. Hilker, T. Meiners. Larval feeding experience influences adult predator acceptance of chemically defended prey; L. Rayor, S. Munson. Do fecal shields provide physical protection to larvae of the tortoise beetle Plagiometriona flavescens and Stolas chalybea against natural enemies? F. Nogueira de Sa, J.R. Trigo. Genetics of adaptations between plants and insects. Host plant use of Phyllotreta nemorum: do coadapted gene complexes play a role? P.W. de Jong, J.K. Nielsen. Evolution of insect&endash;plant relationships. Evolution of insect-plant relationships: chemical constraints, coadaptation, and concordance of in